[MISC] Question: What is allowed when we have subcommands?

test/unit/detail/format_help_test.cpp

@@ -628,40 +628,8 @@ TEST(help_page_printing, copyright)
 TEST(parse_test, subcommand_parser)
 {
     int option_value{};
-    std::string option_value2{};
 
     char const * argv[]{"./test_parser", "-h"};
     sharg::parser top_level_parser{"test_parser", 2, argv, sharg::update_notifications::on, {"sub1", "sub2"}};
-    sharg::detail::test_accessor::set_terminal_width(top_level_parser, 80);
-    top_level_parser.info.description.push_back("description");
-    top_level_parser.add_option(option_value,
-                                sharg::config{.short_id = 'f', .long_id = "foo", .description = "foo bar."});
-
-    testing::internal::CaptureStdout();
-    EXPECT_EXIT(top_level_parser.parse(), ::testing::ExitedWithCode(EXIT_SUCCESS), "");
-    std::string std_cout = testing::internal::GetCapturedStdout();
-
-    std::string expected = "test_parser\n"
-                           "===========\n"
-                           "\n"
-                           "DESCRIPTION\n"
-                           "    description\n"
-                           "\n"
-                           "SUBCOMMANDS\n"
-                           "    This program must be invoked with one of the following subcommands:\n"
-                           "    - sub1\n"
-                           "    - sub2\n"
-                           "    See the respective help page for further details (e.g. by calling\n"
-                           "    test_parser sub1 -h).\n"
-                           "\n"
-                           "    The following options below belong to the top-level parser and need to be\n"
-                           "    specified before the subcommand key word. Every argument after the\n"
-                           "    subcommand key word is passed on to the corresponding sub-parser.\n"
-                           "\nOPTIONS\n"
-                           "    -f, --foo (signed 32 bit integer)\n"
-                           "          foo bar. Default: 0\n"
-                           "\n"
-                         + basic_options_str + "\n" + basic_version_str;
-
-    EXPECT_EQ(std_cout, expected);
+    EXPECT_THROW(top_level_parser.add_option(option_value, sharg::config{.long_id = "foo"}), sharg::design_error);
 }